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/*
* thd_sys_fs.cpp: sysfs class implementation
*
* Copyright (C) 2012 Intel Corporation. All rights reserved.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License version
* 2 or later as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
* 02110-1301, USA.
*
*
* Author Name <Srinivas.Pandruvada@linux.intel.com>
*
*/
#include "thd_sys_fs.h"
#include "thd_common.h"
#include <stdlib.h>
int csys_fs::write(const std::string &path, const std::string &buf) {
std::string p = base_path + path;
int fd = ::open(p.c_str(), O_WRONLY);
if (fd < 0) {
thd_log_warn("sysfs write failed %s\n", path.c_str());
return -errno;
}
int ret = ::write(fd, buf.c_str(), buf.size());
if (ret < 0)
thd_log_warn("sysfs write failed %s\n", path.c_str());
close(fd);
return ret;
}
int csys_fs::write(const std::string &path, unsigned int position, unsigned
long long data) {
std::string p = base_path + path;
int fd = ::open(p.c_str(), O_WRONLY);
if (fd < 0) {
thd_log_warn("sysfs write failed %s\n", path.c_str());
return -errno;
}
if (::lseek(fd, position, SEEK_CUR) == -1) {
thd_log_warn("sysfs write failed %s\n", path.c_str());
return -errno;
}
int ret = ::write(fd, &data, sizeof(data));
if (ret < 0)
thd_log_warn("sysfs write failed %s\n", path.c_str());
close(fd);
return ret;
}
int csys_fs::write(const std::string &path, unsigned int data) {
std::ostringstream os;
os << data;
return csys_fs::write(path, os.str());
}
int csys_fs::read(const std::string &path, char *buf, int len) {
std::string p = base_path + path;
int fd = ::open(p.c_str(), O_RDONLY);
if (fd < 0) {
thd_log_warn("sysfs read failed %s\n", path.c_str());
return -errno;
}
int ret = ::read(fd, buf, len);
if (ret < 0)
thd_log_warn("sysfs read failed %s\n", path.c_str());
close(fd);
return ret;
}
int csys_fs::read(const std::string &path, unsigned int position, char *buf,
int len) {
std::string p = base_path + path;
int fd = ::open(p.c_str(), O_RDONLY);
if (fd < 0) {
thd_log_warn("sysfs read failed %s\n", path.c_str());
return -errno;
}
if (::lseek(fd, position, SEEK_CUR) == -1) {
thd_log_warn("sysfs read failed %s\n", path.c_str());
return -errno;
}
int ret = ::read(fd, buf, len);
if (ret < 0)
thd_log_warn("sysfs read failed %s\n", path.c_str());
close(fd);
return ret;
}
int csys_fs::read(const std::string &path, unsigned int *ptr_val) {
std::string p = base_path + path;
char str[16];
int ret;
int fd = ::open(p.c_str(), O_RDONLY);
if (fd < 0) {
thd_log_warn("sysfs read failed %s\n", path.c_str());
return -errno;
}
ret = ::read(fd, str, sizeof(str));
if (ret > 0)
*ptr_val = atoi(str);
else
thd_log_warn("sysfs read failed %s\n", path.c_str());
close(fd);
return ret;
}
int csys_fs::read(const std::string &path, unsigned long *ptr_val) {
std::string p = base_path + path;
char str[32];
int ret;
int fd = ::open(p.c_str(), O_RDONLY);
if (fd < 0) {
thd_log_warn("sysfs read failed %s\n", path.c_str());
return -errno;
}
ret = ::read(fd, str, sizeof(str));
if (ret > 0)
*ptr_val = atol(str);
else
thd_log_warn("sysfs read failed %s\n", path.c_str());
close(fd);
return ret;
}
int csys_fs::read(const std::string &path, std::string &buf) {
std::string p = base_path + path;
std::ifstream f(p.c_str(), std::fstream::in);
if (f.fail()) {
thd_log_warn("sysfs read failed %s\n", path.c_str());
return -EINVAL;
}
int ret = 0;
f >> buf;
if (f.bad()) {
thd_log_warn("sysfs read failed %s\n", path.c_str());
ret = -EIO;
}
f.close();
return ret;
}
bool csys_fs::exists(const std::string &path) {
struct stat s;
return (bool) (stat((base_path + path).c_str(), &s) == 0);
}
bool csys_fs::exists() {
return csys_fs::exists("");
}
int csys_fs::read_symbolic_link_value(const std::string &path, char *buf,
int len) {
std::string p = base_path + path;
int ret = ::readlink(p.c_str(), buf, len);
if (ret < 0) {
thd_log_warn("read_symbolic_link %s\n", path.c_str());
return -errno;
}
buf[ret] = '\0';
return 0;
}
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